EP3020260A2 - Achtförmiges kühlsystem mit einem geschlossenen regelkreis für eine elektronische anzeige - Google Patents

Achtförmiges kühlsystem mit einem geschlossenen regelkreis für eine elektronische anzeige

Info

Publication number
EP3020260A2
EP3020260A2 EP14823073.3A EP14823073A EP3020260A2 EP 3020260 A2 EP3020260 A2 EP 3020260A2 EP 14823073 A EP14823073 A EP 14823073A EP 3020260 A2 EP3020260 A2 EP 3020260A2
Authority
EP
European Patent Office
Prior art keywords
channel
open loop
cooling assembly
circulating gas
electronic display
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP14823073.3A
Other languages
English (en)
French (fr)
Other versions
EP3020260A4 (de
Inventor
William Dunn
Kevin O'CONNER
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
MRI Inc
Manufacturing Resources International Inc
Original Assignee
MRI Inc
Manufacturing Resources International Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by MRI Inc, Manufacturing Resources International Inc filed Critical MRI Inc
Publication of EP3020260A2 publication Critical patent/EP3020260A2/de
Publication of EP3020260A4 publication Critical patent/EP3020260A4/de
Withdrawn legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/133382—Heating or cooling of liquid crystal cells other than for activation, e.g. circuits or arrangements for temperature control, stabilisation or uniform distribution over the cell
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K7/00—Constructional details common to different types of electric apparatus
    • H05K7/20—Modifications to facilitate cooling, ventilating, or heating
    • H05K7/20954—Modifications to facilitate cooling, ventilating, or heating for display panels
    • H05K7/20972—Forced ventilation, e.g. on heat dissipaters coupled to components
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/133382—Heating or cooling of liquid crystal cells other than for activation, e.g. circuits or arrangements for temperature control, stabilisation or uniform distribution over the cell
    • G02F1/133385—Heating or cooling of liquid crystal cells other than for activation, e.g. circuits or arrangements for temperature control, stabilisation or uniform distribution over the cell with cooling means, e.g. fans
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F2201/00—Constructional arrangements not provided for in groups G02F1/00 - G02F7/00
    • G02F2201/36—Airflow channels, e.g. constructional arrangements facilitating the flow of air

Definitions

  • FIGURE EIGHT CLOSED LOOP COOLING SYSTEM FOR ELECTRONIC
  • Embodiments generally relate to cooling systems for electronic displays.
  • Electronic displays are sometimes used in outdoor environments or other areas where the surrounding temperatures may be high or there may be other sources of heat such as solar loading causing the temperatures within the display to rise.
  • some portions of the display can be difficult to cool as simply ingesting ambient air into some portions of the display can introduce dust and contaminates into sensitive portions of the display, which can lead to premature failures.
  • Exemplary embodiments provide a figure eight closed loop circulating gas path which defines a center channel for the closed loop of circulating gas.
  • a pair of open loop ambient air channels may be placed on opposite sides of the center channel, in order to remove heat from at least the center channel and the closed loop circulating gas.
  • One or more open loop ambient air pathways may pass through the figure eight but do not allow the circulating gas and the ambient air to mix.
  • the open loop ambient air pathway travels along a rear surface of the electronic display.
  • the circulating gas pathways contain a front channel placed in front of the electronic display, a rear channel placed behind the electronic display, and a center channel placed between the front and rear channels. Pass-through apertures may be placed within the path of the circulating gas and/or the ambient air to allow the paths of the two gaseous matters to cross without allowing them to mix with one another.
  • FIGURE 1 is a simplified illustration of an exemplary embodiment of the figure eight closed loop cooling system.
  • FIGURE 2 is a side rear perspective view showing the overall assembly of the display with the rear cover removed and indicating the section line 3-3.
  • FIGURE 3 is a perspective section view taken from the section line 3-3 and indicating the locations for Detail 4 and Detail 5.
  • FIGURE 4 is a detailed perspective section view of Detail 4.
  • FIGURE 5 is a detailed perspective section view of Detail 5.
  • FIGURE 6 is a bottom rear perspective view showing the overall assembly of the display and indicating the section line 7-7.
  • FIGURE 7 is a perspective section view taken from the section line 7-7.
  • FIGURE 1 is a simplified illustration of an exemplary embodiment of the figure eight closed loop cooling system 400.
  • This exemplary embodiment contains a plurality of channels in the assembly.
  • the front channel 18 is placed in front of the display 160 and preferably allows closed loop circulating gas 20 to remove heat from the front of the display 160.
  • the front open loop channel 16 is positioned behind the display 160 and preferably allows open loop air 15 to pass behind the display 160, removing heat at least from the rear portion of the display 160 and the center channel 13.
  • the center channel 13 is preferably positioned between the front open loop channel 16 and the rear open loop channel 1 1 and allows closed loop circulating gas 20 to cross paths with itself (creating the figure eight) and to cross paths with the open loop air 10 and 15 without allowing the closed loop circulating gas and open loop air to mix.
  • the rear open loop channel 1 1 is preferably positioned immediately adjacent to the center channel 13, and allows open loop air 10 to flow through, thereby removing heat from the center channel 13 (and/or the closed loop circulating gas 13 contained within) and the rear channel 30.
  • the rear channel 30 is positioned near the rear of the display and may contain various electronic components 35 for operating the overall display assembly, fans, or the display 160 itself.
  • the front channel 18, center channel 13, and rear channel 30 are in sealed gaseous communication with each other. In other words, these channels do not permit closed loop circulating gas 20 to substantially escape or to allow ambient air or open loop air to enter these channels.
  • open loop air 10 and 15 is simply ambient air surrounding the display assembly. However, in some embodiments the open loop air 10 and 15 may be treated in some way (ex. filtered, air conditioned, or pre-cooled in some way) prior to being ingested into the display assembly.
  • the closed loop fan 100 is positioned within the rear channel 30, although this is not required.
  • FIGURE 2 is a side rear perspective view showing the overall assembly of the display with the rear cover removed and indicating the section line 3-3.
  • the display assembly is designed for a portrait orientation with the closed loop fans 100 positioned at the top of the assembly and the open loop fans 200 positioned at the bottom of the assembly.
  • the open loop fans 200 do not have to be placed at the bottom of the assembly, but could be positioned anywhere so that the open loop air travels in the paths specified in these exemplary embodiments. It of course goes without saying that additional fans could also be used to increase flow rates and/or pressure.
  • FIGURE 3 is a perspective section view taken from the section line 3-3 and indicating the locations for Detail 4 and Detail 5.
  • the front channel 18 is defined between the front transparent plate 150 and the electronic display 160.
  • the electronic display 160 may be an LED backlit liquid crystal display (LCD), but this is not required.
  • Alternative embodiments may utilize any type of flat panel electronic display, including but not limited to plasma, OLED, electroluminescent polymers, or similar.
  • the various electrical components 35 power supplies, printed circuit boards, microprocessors, electronic storage, etc.
  • a plate 31 which may form the rear portion of channel 1 1 for open loop air 10.
  • FIGURE 4 is a detailed perspective section view of Detail 4. Closed loop circulating gas 20 is permitted to pass through the rear open loop channel 1 1 without mixing with the open loop air 10 by use of pass-through apertures 200, which provide sealed gaseous communication between the rear channel 30 and the center channel 13, without permitting open loop air 10 to enter the channels 30 and 13.
  • rear open loop channel 1 1 may also contain cooling fins 400 for distributing heat from the adjacent channels (30 and 13) and/or electronic components 35 in order to be efficiently removed by the open loop air 10.
  • front open loop channel 16 may also contain cooling fins 450 for distributing heat from the adjacent channels (30 and 18) and/or the rear surface of the display 160 in order to be efficiently removed by the open loop air 15.
  • the display 160 contains a direct lit LED backlight where the cooling fins 450 are placed in thermal communication with the LED backlight.
  • the cooling fins 450 and 400 may be comprised of any thermally conductive material, but would preferably be comprised of metal and in an exemplary embodiment would be a thin sheet (or multiple thin sheets) of metal.
  • FIGURE 5 is a detailed perspective section view of Detail 5. Closed loop circulating gas 20 is permitted to pass through the front open loop channel 16 without mixing with the open loop air 15 by use of pass-through apertures 205, which provide sealed gaseous communication between the front channel 18 and the center channel 13, without permitting open loop air 15 to enter the channels 18 and 13.
  • FIGURE 6 is a bottom rear perspective view showing the overall assembly of the display and indicating the section line 7-7.
  • FIGURE 7 is a perspective section view taken from the section line 7-7.
  • the center channel 13 is preferably divided into a plurality of subchannels 300 and 305.
  • subchannels 300 are in gaseous communication with the pass-through apertures 200 (which connects the subchannel 300 with the rear channel 30) while subchannels 305 are in gaseous communication with the pass- through apertures 205 (which connects the subchannel 305 with the front channel 18).
  • subchannels 300 are in gaseous communication with the pass-through apertures 205 (which connects the subchannel 300 with the front channel 18) while subchannels 305 are in gaseous communication with the pass-through apertures 200 (which connects the subchannel 305 with the rear channel 30).
  • the closed loop of circulating gas 20 travels through the front channel 18, through a pass-through aperture to travel along subchannel 305, through another pass-through aperture to travel along the rear channel 30, through another pass-through aperture to travel along the subchannel 300, and finally through another pass-through aperture to return to the front channel 18.
  • the closed loop of circulating gas 20 performs the 'figure eight' through the assembly, as it weaves its way across the front channel 18, through the center channel 13, across the rear channel 30, again through the center channel 13, and returning to the front channel 18.
  • subchannels 300 and 305 may not be required in some embodiments as the center channel 13 could be completely open. It should also be noted that other embodiments may use the subchannels 300 and 305 but would not allow a single subchannel to communicate gaseously with both the front channel 18 and the rear channel 30. In other words, when viewing the end of the assembly as shown in Figure 7, the opposing end of the assembly would be substantially similar. Thus, subchannels 300 would only communicate with pass-through apertures 200 and the rear channel 30, while the subchannels 305 would only communicate with pass-through apertures 205 and front channel 18. Thus, in this embodiment there would be two separate closed loops.
  • subchannel 300 directs the flow of closed loop circulating gas 20 through rear channel 30 and center channel 13 while subchannel 305 directs the flow of closed loop circulating gas 20 through the center channel 13 and front channel 18.
  • the subchannels 300 and 305 allow separate flow paths for closed loop circulating gas 20 within the center channel 13, without requiring additional fans. These separate flow paths which cross through the center and loop around the display in a single continuous flow, define the figure eight path for the closed loop circulating gas 20 (seen also in Figure 1 ).
  • the flow direction of closed loop circulating gas 20 through the center channel 13 is opposite the flow direction of open loop air 15 and 10, creating a counter-flow heat exchanger between the center channel 13 and the front/rear open loop channels 1 1 and 16.
  • this is not required, as a parallel flow or a cross flow design would work as well.
  • the rear channel 30 would share a plate with the rear open loop channel 1 1 , such that one side of the plate would be within the rear channel 30 while the opposing side of the plate would be within the rear open loop channel 1 1 .
  • This arrangement is illustrated in Figure 3 with the rear plate 31 .
  • the rear surface of the display 160 may also be preferable for the rear surface of the display 160 to form the front wall of the front open loop 16, such that open loop ambient air 15 can remove heat from the electronic display 160.
  • the rear surface of the display 160 would be the rear surface of a metallic PCB holding a plurality of LEDs for the backlight.

Landscapes

  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • Mathematical Physics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Engineering & Computer Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Thermal Sciences (AREA)
  • Devices For Indicating Variable Information By Combining Individual Elements (AREA)
  • Cooling Or The Like Of Electrical Apparatus (AREA)
EP14823073.3A 2013-07-08 2014-07-08 Achtförmiges kühlsystem mit einem geschlossenen regelkreis für eine elektronische anzeige Withdrawn EP3020260A4 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US201361843706P 2013-07-08 2013-07-08
PCT/US2014/045766 WO2015006335A2 (en) 2013-07-08 2014-07-08 Figure eight closed loop cooling system for electronic display

Publications (2)

Publication Number Publication Date
EP3020260A2 true EP3020260A2 (de) 2016-05-18
EP3020260A4 EP3020260A4 (de) 2017-03-15

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP14823073.3A Withdrawn EP3020260A4 (de) 2013-07-08 2014-07-08 Achtförmiges kühlsystem mit einem geschlossenen regelkreis für eine elektronische anzeige

Country Status (6)

Country Link
US (3) US9470924B2 (de)
EP (1) EP3020260A4 (de)
KR (1) KR101894027B1 (de)
AU (2) AU2014287438B2 (de)
CA (1) CA2917868A1 (de)
WO (1) WO2015006335A2 (de)

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EP3020260A4 (de) 2017-03-15
AU2017216500A1 (en) 2017-08-31
US20180364519A1 (en) 2018-12-20
AU2014287438B2 (en) 2017-09-28
KR20160030519A (ko) 2016-03-18
US20170023823A1 (en) 2017-01-26
WO2015006335A3 (en) 2015-11-12
US9470924B2 (en) 2016-10-18
AU2014287438A1 (en) 2016-02-04
US10088702B2 (en) 2018-10-02
CA2917868A1 (en) 2015-01-15
US20150009627A1 (en) 2015-01-08
US10359659B2 (en) 2019-07-23
WO2015006335A2 (en) 2015-01-15
KR101894027B1 (ko) 2018-08-31
AU2017216500B2 (en) 2018-10-04

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